Nerd facts
How it loads
Nordostpassagen pano
How the deep zoom on this page loads.
Actually loaded
Open media to see the current file.
Deep zoom
Deep zoom is for images that are too large to behave like normal photos. DZI, short for Deep Zoom Image, describes how the large image has been cut into smaller pieces.
As you pan and zoom, the browser asks for only the visible pieces at the needed detail level. That keeps huge stitched or archival images usable without loading the full monster at once.
Deep Zoom · DZI in OpenSeadragon
Why the variants exist
Browsers, screens, networks, and media types do not agree on one perfect file. The page stays simple, while the saved asset details keep source kind, quality level, preview confidence, dimensions, format, and fallback intent.
Each asset gets the special handling it needs. The goal is not to show off file formats; it is to make the page choose the right thing quietly, then explain the machinery only when you ask.
